| abstract |
Novel compounds having a general formula: <IMAGE> where m, n are 0 or 1, R1 represents hydrogen, alkyl, alkoxy, alkoxy substituted alkyl, alkanoyl, alkanoyloxy, alkoxycarbonyl or alkoxycarbonyloxy, <IMAGE> represents cyclic groups, each of X, Y, Z is hydrogen or fluorine, at least one being fluorine, B is F, CL or CF3. Preferred compounds have a formula <IMAGE> where R1 is C1-12 alkyl or alkoxy, B is fluorine. The compounds may be used as components of liquid crystal compositions, having a low viscosity and high clearing point. |